Oil filter



March 18, 1930. I 'MAUNULA ET AL 1,750,935

I OIL FILTER Filed Feb. 19, 1929 INVENTOR.

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Patented Mar. 18, 1930 UNITED STATES PATENT OFFICE OTTO A. MAUNULA AND WILLIAM R. ROWLAND, F ASTORIA, OREGON, ASSIGNORS TO DIESEL FILTER 00., OF ASTORIA, OREGON OIL FILTER Application filed February 19, 1929. Serial No. 341,093.

' This invention relates to an oil filter particularly adapted for use in connection with engines of the Diesel type, and has for its primary object to provide, in a manner as hereinafter set forth, a filter for cleansing the oil during its travel from the engine to the sup ply tank, in which the oil is passed through a filtering medium of increasing fineness during such travel.

A further object of the invention is to provide a filter for the purpose aforesaid including a control device therefor, by means of which the oil may be diverted from the filter if desired, to permit the cleansing of the filter by compressed air during the operation of the engine.

With the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts as hereinafter more particularly described, and as illustrated in the accompanying drawing in which is shown a preferred embodiment of the invention, but it is to be understood that such drawing and description are to be taken as illustrative and that the invention is intended to be limited only by the scope of the claims hereunto appended.

In the drawings in which like numerals are employed to designate like parts throughout the same:

Figure 1 is an elevation of a filter constructed in accordance with this invention.

Figure 2 is an enlarged vertical section thereof, with the control device removed.

Figure 3 is a transverse section of the embodiment illustrated in Figure 2f Figure 4 is a perspective view of one of the filtering strips as it would appear before being compressed between the screens.

Referring to the drawings in detail, the numeral 1 desi nates a cylindrical shell having a conical bottom 2 terminating in an apertured nipple 3 to provide a drain for the shell and formed with external threads for engagement with a suitable drain pipe 4. The shell is open at its top and is provided at its upper end with an outturned flange 5. Seated on the flange 5 and secured thereto by means of suitable holdfast devices 6 is an annulus 7, the outer peripheral portion of which is of greater thickness than the remaining portion thereof to provide a shoulder. 8. Seated on the annulus 7 is a head plate 9, the peripheral edge of which is in abutment with" the shoulder 8.

Depending from the annulus 7 is a filtering device indicated generally by the numeral 10, which extends longitudinally of the shell 1 and terminates adjacent the upper portion of the conical bottom 2. The filtering device 10 is secured to the annulus 7 by means of a plurality of relatively long bolts 11, the upper ends of which are secured to the annulus 7. The bolts 11 extend downwardly from the annulus 7 adjacent the inner peripheral edge thereof and further extend through openings 13 in a circular bottom plate 14, which is adjustably secured to the bolts 11 by means of nuts 15 threaded on the lower ends of the bolts.

The plate 14 is formed with a central opening 16 to provide a drain for the filtering device 10, said opening being controlled by a manually operated valve 17. The valve 17 is in the form of a plate slidably mounted on a pair of studs 18 depending from the plate 14 and is normally held in position to close the opening 16 by means of a rod 19 which is of materiallyless diameter than the diameter of the' opening 16 and extends upwardly therethrough. The rod 19 extends through the top wall of an L-coupling 20 which is in threaded engagementwith .the wall of an opening formed centrally of the plate 9, and. is provided at its upper end with a nut 21 for engpgement with the upper face of said top wal By manipulation of the nut 21 the valve 17 may be operated on the studs 18 to open or close the opening 16 as desired.

Fixedly secured to the bottom plate 14 is a cylindrical screen 22, the outer periphery of which is flush with the peripheral edge of the plate 14. Fixedly secured to the plate 14, in spaced relation to the screen 22, is a similar screen 23. The screens 22 and 23 extend longitudinally of-the shell 1 and have their upper edges in abutment with the lower face of the annulus 7. The bolts 11 are arranged in a circular row and are disposed adjacent the inner face-of the screen 23. Disposed between the screens 22 and 23 is a plurality of filtering strips 24, preferably of felt, WhlCh are d1sposed vertically and extend through the length of the screens. The strips 24 are compressed between the screens circumferentially thereof, whereby the strips individually assume substantially a wedge shape in transverse section with their inner edge portions of greater density than their outer edge por tions.

Disposed outwardly of the shell 1 is a control device indicated generally by the numeral 27 and including a valved T-coupling 28, which is connected with the engine with which the filter is associated by means of a conduit 29. Leading from the couphng 28 is a pipe 30 which opens into an air chamber housing 31, adjacent the bottom of the latter.

' Extending from the bottom of the housing 31 pling 37 by means of a pair of pipes 38 and 39, The four-way coupling 37 is connected with the pipe 30 by means of an L-shaped pipe 40 which is provided with a safety valve 41. Opening into the T-coupling 36 is an air line 42, which is adapted for connection with a compressed air tank, not shown. Extending from the four-way coupling 37 is aconduit 43 which is adapted for connection with the supply tank for the engine.

The valvedT-couplings 28 and 36 are simultaneously controlled by means of a pair of levers 44 and 45 respectively connected therewith, and a link 46, the upper end of which is pivotally connected to the lever 45 adjacent the free end of the latter, and the lower end of which is pivotally connected to the lever 44 intermediate the ends of the latter. By manipulation of the lever 44, the valves within the T-couplings 28 and 36 are controlled simultaneously.

When our filtering device is in operation, the lever 44 is positioned in the manner indicated in full lines in Figure 1 which establishes communication between the conduit 29 and pipe 30 and between the pipes 35 and 39. In this position the pipe 38 is closed to the T-coupling 28 and the air line 42 is closed to the T-coupling 36. The oil from the engine is admitted to the shell 1 through the pipe 32 and the heavier particles contained in the oil are deflected toward the conical bottom 2 by meansof the annular bafile member 34. The lighter oil rises within within the innermost screen 23. Due to the increase in density of the strips 24 from the outer edges thereof to the inner edges thereof,

the passage of the oil through the strips is increasingly resisted. After the oil has passed 'through the strips 24, it is discharged from the filtering device 10 through the pipe 35 and is returned through the conduit 43 to the supply tank.

When it is desired to clean the filtering device 10, the lever 44 is positioned in the manner indicated by dotted lines in Figure 1, which closes communication between the conduit 29 and pipe 30 and between the pipes 35 and 39. In this position the oil passes from the T- coupling 28 through the pipe 38 and four-way coupling 37 to the conduit 43 and is returned directly to the supply tank. Compressed air may then be admitted through the T-coupling 36 and pass through the pipe 35 into the interior of the filtering device 10 to cleanse the strips 24. After the cleansing operation, the 1mpure particles blown from the strips 24 may be withdrawn from the shell 1 through the drain 3.

It is thought that the many advantages of a filter in accordance with this invention will be readily apparent, and although the preferred embodiment of the invention is as illustrated and described, yet it is to be understood that changes in the details of construction may be made, which fall within the scope of the invention as defined in the appended claims.

What we claim is:

1. A filtering device comprising, a shell,

a pair of concentrically arranged, spaced screens within the shell, a filtering medium interposed between the screens and having a portion thereof adjacent one screen of greater density than the remaining portion thereof, and means for conducting oil into the shell at one side of said filtering medium and out of the shell from the opposite side of said filtering medium.

2. A filtering device comprising, a shell, 9.

pair of concentrically arranged, spaced screens within the shell, a plurality of compressed filtering strips interposed between the screens and having their inner edge portions of greater density than their outer edge portions, and means for conducting oil into the shell exteriorly of said screens and out of the shell from the interior of the screens.

3. A filter comprising, an open top cylindrical shell having a conical bottom provided with a drain, a closure means for said top, a plurality of rods depending from said closure means into the shell, a circular plate adjustably supported by said rods, a pair of concentrically arranged, spaced screens with in the shell, a filtering medium interposed between the screens and having a portion thereconducting oil into of adjacent one screen of greater density than the remaining portion thereof, and means for the shell at one side of said filtering medium and out of the shell from the opposite side of said filtering medium.

4:. A filter comprising, an open top cylindrical shell having a conical bottom provided with a drain, a closure means for said top, a plurality of rods depending from said closure means into the shell, a circular plate adjustably supported by said rods, a pair of concentrically arranged, spaced screens within the shell, a filtering medium interposed between the screens and having a portion thereof adjacent one screen of greater density than the remaining portion thereof, said plate being provided with a centrally disposed opening, a manually operated valve-for controlling said opening, and means for conducting oil into the shell at one side of said filtering medium and out of the shell from the opposite side of said filtering medium.

5. A filter comprising, an open top cylindrical shell having a conical bottom provided with a drain, a closure means for said top,

. a plurality of rods depending from said 010- plate being provided with a centrally sure means into the shell, a circular plate adjustably supported by said rods, a pair of concentrically arranged, spaced screens within the shell, a filtering medium interposed between thescreens and having a portion thereof adjacent one screen of greater density than the remaining portion thereof, .said

disposed openmg, a manually operated valve for controlling said opening, an annular baffle member depending from said plate, and means for conducting oil into the shell for discharge adj acent said baffle member and out of the top of the shell centrally thereof.

6. A filter comprising, concentrically arranged, spaced screens within the shell, a filtering medium interposed between the screens and having a P01111011.

thereof adjacent one screen of greater-density than the remaining port-ion thereof, a conduit adapted for connection with an engine to provide for the passage of oil into said shell at one side of said screens, a second conduit for the passage of oil from the opposite side of said screens to a supply 'tank, and means connected to said conduits for selectively passing the oil from one to the other exteriorly of said shell. v

7. A filter comprising, ashell, a pair of concentrically arranged, spaced screens Within the shell, a filtering medium interposed between the screens and having a portion thereof adjacent one screen of greater density than the remaining portion thereof, a conduit adapted for connection with .an engine to provide for the passage of oil into said shell at one side of said screens, a second conduit for the passage of oil from the a shell, a pair of opposite side of said screens to a supply tank, means connected with said conduit for selectively passing the oil from one to the other exteriorly of said shell, and means for forcingair through one of said conduits into said shell for cleaning said filtering medium.

8. A filtering device comprising, a shell, a pair of concentrically arranged, spaced screens within the shell, a filter-mg medium interposed between the screens, said filtering medium extending throughout the space between the screens and having a portion thereof adjacent one screen of greater density than the remaining portion thereof, and means for conducting oil'into the shell at one side of said filtering medium and out of the shell fromthe opposite side of said filtering medium.

9. A filtering device comprising, a shell,

a pair of concentrically arranged, spaced screens within the shell, a filtering medium interposed between the screens, said filtering medium being compressed circumferentially of the screens to provlde a continuous portion thereof adjacent one screen with a greater density than the remaining portion thereof, and means for conducting oil into the shell at one side of said filtering medium and out of the shell from the opposite side of said filtering medium.

10. A filtering device comprising, a plurality of filtering strips arranged in assembled relation to provide. an annulus, and means for maintaining said strips in assembled relation, said strips normally being of uniform thickness throughout and compressed circumferentially of the annulus when in assembled relation to provide the annulus with a graduating density from one peripheral face to the other.

11. A filtering device comprising, a filtering medium, and means for supporting the filtering medium in the form of an annulus, said filtering medium being compressed circumferentially of the annulus to provide the latter with a greater density adjacent its inner periphery than the density thereof adjacent its outer periphery.

12. A filtering device comprising, a plurality of filtering strips arranged in assembled relation with the side faces of adjacent strips in opposed, contacting relation throughout, and means for maintaining the strips in assembled relation, said strips normally being of uniform thickness throughout and compressed when in assembled relation to provide one edge face of each strip with a greater area than the opposite edge face thereof.

13. A filtering device comprising, a plurality of filtering strips normally of uniouter and inner faces of the annulus, and

means for maintaining said strips in assembled relation, each of said outer and inner faces being of unbroken area, said outer face having 'a, greater area than said inner face.

In testimony whereof, We aflix our signatures hereto.

OTTO A. MAUNULA. WILLIAM R. ROWLAND. 

